Legendary Duelists

Cannot be Normal Summoned/Set. Must be Special Summoned with the effect of a Bonding Spell/Trap. If this card is Special Summoned: You can activate this effect; Effect Monsters your opponent currently controls cannot activate their effects for the rest of this turn, also change their ATK to 0 until the end of this turn. (Quick Effect): You can Tribute this card; Special Summon 2 Water Dragon from your hand and/or Deck in Defense Position, ignoring their Summoning conditions.

You can discard this card; add 1 Bonding Spell/Trap from your Deck to your hand. If this card is Normal or Special Summoned: You can target 1 Hydrogeddon, Oxygeddon, or Duoterion in your GY; Special Summon it. You can only use each effect of Duoterion once per turn.

Tribute 2 Duoterion and 1 Oxygeddon in your hand and/or field; Special Summon 1 Water Dragon or Water Dragon Cluster from your hand, Deck, or GY. (This is treated as a Special Summon with the effect of Bonding - H2O.) If Water Dragon or Water Dragon Cluster is sent from the field to your GY while this card is in your GY: Add this card to your hand. You can only use this effect of Bonding - D2O once per turn.

Shuffle 1 Duoterion, 1 Hydrogeddon, and 1 Oxygeddon from your hand and/or GY into the Deck; Special Summon 1 Water Dragon Cluster from your hand or GY. You can banish this card from your GY; add 1 Water Dragon or Water Dragon Cluster from your Deck or GY to your hand.

When this card destroys an opponent's monster by battle and sends it to the GY: You can Special Summon 1 Hydrogeddon from your Deck.

If this card is destroyed by battle with a Pyro monster and sent to the GY: Each player takes 800 damage.

Cannot be Normal Summoned/Set. Must be Special Summoned with Bonding - H2O. The ATK of FIRE monsters and Pyro monsters on the field becomes 0. When this card is destroyed and sent to the GY: You can target 2 Hydrogeddon and 1 Oxygeddon in your GY; Special Summon them.

When an opponent's monster declares an attack: You can send this card from your hand to the GY; change the attacking monster to Defense Position. When you Ritual Summon a monster, you can banish this card from your GY as 1 of the monsters required for the Ritual Summon.

If this card is destroyed by battle and sent to the GY: Destroy the monster that destroyed this card.

If this card battles a non-Normal Monster, this card gains 500 ATK during the Damage Step only.

Once per turn: You can target 1 Set card in your opponent's Spell & Trap Zone; while this card is face-up on the field, its target(s) cannot be activated.

Target 2 face-up monsters on the field; halve the ATK of 1 monster, and if you do, add that lost ATK to the other monster. These effects last until the End Phase.